rand_xoshiro: Update 0.8.1 release to today

Author: vks

rand_xoshiro/CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.8.1] - 2026-05-15
+## [0.8.1] - 2026-05-16
 ### Added
 - `state()` method on every RNG type returning the internal state as a value
   matching `SeedableRng::Seed`, allowing reproduction via `from_seed` without